Toyota has named energy company British Gas as its preferred supplier

"British Gas will offer private and fleet/business buyers a free site survey and advice on the options for electric vehicle charging, which include a simple three-pin socket costing from £275 and a more advanced charging unit with prices starting at £799"

http://cleanfuelconnectionnews.com/electric-vehicle-charger/british-gas-named-electric-vehicle-charger-supplier-for-toyota/